This map shows the latest hourly readings downloaded from pollution analysers. Not all analysers on the network are contacted every hour, so some sites may show 'no data'. Data have undergone automatic validity checks.

You can find out more information about each location (monitoring site) by clicking on its dot on the map.
Once selected you can find out further information by clicking the 'Site Details' link above.
Click the 'Statistics' link above to see results from this site compared to national limit values.